If you are running Ninja forms, check your version immediately. The experts at Sucuri run regular audits on their Sucuri Firewall and discovered a major vulnerability in Ninja Forms in versions 2.9.55.1 and earlier. If you are running one of these versions, make sure you update to the patched version of 2.9.55.2.

The vulnerability can be exploited by any registered user, even at a subscriber role. If you allow user registration and run Ninja Forms, take extra note of this vulnerability and update immediately. The vulnerability comes from a $meta_value variable concatenated to an SQL query without being escaped first. As we have mentioned in previous posts (XSS, What is it and should I be concerned?) this can be a huge vulnerability.

This particular function can be exploited through a shortcode that contains a list of parameters in their raw unescaped value. Sucuri showed an example on their blog [ninja_forms_display_sub_number id=”123′ SQL INJECTION OCCURS HERE”] of how easy it was to exploit. The reason this is such a big vulnerability is because this can be performed by any registered user even with the role of a subscriber as mentioned earlier.

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Disclaimer: We are not certified security experts. We are giving a high-level overview of web security so that you can be more informed about some of the most common security vulnerabilities to look out for when developing or finding a developer. We will also be sharing some resources to help you continue your research on web security.